Paper-cutting machine



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Filed Aug. 27, 1925 v17 Sheets-Sheet 12 Junelz. 192s.

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T. c. DEXTER PAPER CUTTING lL/mum4 17 Sheets-Sheet 17 Filed Aug. 27. 1925 yPatented June 12, 1928.

TALBOT C.V DEXTER,OF PEARL, RIVER, NEW' YORK.

PAPER-CUTTING MACHINE.

Applieation med Augustf27, 1925. Serial No. '522741.

This invention relates to paper-cutting machines of the guillotine type and particularly to Va heavy duty power driven machlne. y Among the objectsof my invention is to provideka machine in `which the descent of the paper clamping means is controlled by the power drive means of the machine and is so timed that the clamp will descend ahead of the knife so that the pile of paper will be clamped soon after the machine is started and then given an additional clamp- V ing pressure before the cutting edge of the knife comes into contact with the surface of the top sheet of paper in the pile.

Another object of my invention is to provide a one-piece clamp which may be lowered and pressed upon a pile of paper as the result of an operation of a treadle and to provide restoring means capable of returning theclamp to its raised position upon an easing off of pressure or change of position of the treadle.

Another object vis to adapt a one-piece` clamp, which has a treadle related thereto for the purpose of preliminarily lowering the clamp to gauge the work independent of.

any power actuation, to be opera le during a cutting cycle ofoperation of a paper cutting machine to descend to the surface of the pile of paper in advance of the knife, and to be securely pressed against the pile of paper during the contact of the knife with the paper. f

Another object is to provide mechanism for lowering the clamp and applying pressure thereto in the lowered position by powxr .afnd independent of the actuation of the Another object is to provide mechanism quires a plurality of movements bythe operative before the machine is connectedy to the source of power and which will be re turned to its normal position when the machine is automatically stopped at the end of a cycle. l

Another object isv to provide operations controlling devices which are under the control of an operative to release shaft locking devices and thereafter cause the machine to be driven by power, said operations controlling device being automatically operated at the conclusion of a' cyle of operation ofthe machine todisconnectthe machine from its source of power, stop kthe machine with the knife in an eleva-ted position, restore an operatives control lever' to normal position, and lock' the shafts from further operation thereby requiring another manipulative ef fort by the operative before the machine can be operated or the knife can descend.

Another object is to Aprovide safety devices which are controlled by the operation controlling mechanisms for locking. the knife in its raised position and releasing it when the machine is to be operated.

With these and incidental objects in view the invention consists of certain novel features of construction and combination of parts, the essential elements of which are set forth in the appended claims and in pre- 'ferred embodiments which are hereinaftcr described with reference to the drawings, in which l Fig. 1 is a. front elevation of the machine. Fig. 2 is a side view from the left of Fig. 1.

Fig. 3 is a rear Fig. 4 is a sectional view-taken )ust to the leftof the foot treadle, and -looking from the left.

Fig. 5 is a plan view with the table, clamps, and knife stock removed'fand the side-frames in" section..

Fig. 6 is a view on line 6--6` of Fig. 5,

elevation of, the machine showing the single stroke automatic -throwi out mechanism for the driving clutch.

Fig. 7 is a similar view just after the power clutch has been thrown out andthe machine stopped.

Fig. 8 is a sectionalview on line 8-8 of Fig. 5, with the parts in their positions of rest.

Figs. 9, and-11 are similar (sections, v showing the relative positions of the knife and clamp during a down stroke, and Fig.

12', is' a view of the same structure on the rising stroke. y

Fig. 13 is across-section of the sl1p clutch between the ower clamp and the additlve pressure applying mechanism.

Fig. 14 is a plan view from the left of Fin'. 13. A

Fig. 15 is a. section on line 15 *15 of Fig. `13, with the pressure transmitting ratchets out of engagement.

Fig. 16 is a similar view showing the relation of the parts with the ratchets in engagement.

Fig. 17 is a. sectional view of a modified form of mechanism for applying pressure to the clamp Aindependent of the operatlon of themachine, and is taken on line 19--19 of Fig. 21.

Fig. 18 is a view of the same mechanlsm with the clamp under pressure. v Fig. 19 illustrates the position of the various parts of the clamping mechanism after pressure has been released.

Fig. 2O is a front elevation of this modified form with parts broken away and in section.'

Fig. 21 is a lan view of the modified form with theta le, clam s, and knife stock removed and the side rames in section.

This view also shows a modied form of yop-v eration Sta-rtinv lever which may be used.

Fig. 22 is a detail of the modified formof operation starting lever in its unlatched position. Y Fig. 23 illust-rates the second posltion with the machine unlocked.

Fig. 24 illustrates the third position when the machine isv clutched for operation.

Fig. 25 is another view of the modified form of controlling and locking mechanism. The frame of the machine consists of two side pieces 1, 2, heldQtogether at their bottoms by three rods 3, and at their tops by a channel casting 4. The' knife stock 5 moves in a ldiagonal direction between front and rear guides 6, 7, fastened to each side` piece of the'machine above the bed or table 8 15nd is provided at its ends with horizontal slots 9 for engagement with the rollers 10 carried by ,straps 11, by which the stock is actuated. The straps consist fof integral castings and move vertically in guides 12, Fig. 2, and are Vreciprocated to elevate and depress the knife stock by means of connecting rods 13 adjustably connected to straps 11 and to cranks 14 on theend of the transverse shaft 15 near the bottom of the machine. For the purpose of adjustment, the connecting rods ened or shortened by a threaded portion 16,

- 33. Crank arm 32 13 are subject to be lengthf --s The shaft 15 is driven in a counterclockwise direction (Fig. 2) by means of power derived from the continuously rotating shaft 1 9 at therear of the machine which is driven by any suitable means. In the accompanying illustration, a belt is shown driving through a fly-wheel 20', and near the center of the shaft there is slidably mounted thereon thel inner member of a friction cone clutch. The outer member 2O of the cone clutch is secured .to sleeve 21 which is loosely journaled on shaft 19 and it has fastened thereon a drive pinion 22 which drives gear 23 on sha-ft 24. yShaft 24 carries pinion 25 which meshes with gear 26 on the knife actuating shaft15.

The engagement of the cone clutch surfaces for starting the operation of themachineis achieved by the manipulation of an operatives handle 27 conveniently located at the right side of the machine. To cause t-he clutch toengage, lever 28 must be swun from right to left around stub'shaft 29 but in order to prevent inadvertent movement or careless manipulation, a tongue (Fig. 1) is provided on the end ofthe lever which engages in a hole in the stub shaft `when -the lever is in its normal position. The tongue israised out of the hole by a slight clockwise rotation of lever rod 28 which causes the sawedged collar 30 fast thereto to displace the lever rod axially. When the operating lever rod is rocked, it swings crank arm 31 which in turn rocks 'crank arm 32 by means of link 1', 3, 4 andv 5, 'the clockwise rotation of which, as seen in Fig. 1, moves slidable shaft 35 to the right by means of a yoke formed by two arms 36, 36 which engage a pin that passes through a collar 37 on shaft 35. This slidable shaft carries a brake block 38 having two edges 39 for coacting with rollers 40, one at each end of an exterior brakeband 41. This brake-band is mounted on the outer surface ofthe outer or driven friction cone 2O and it consists of two bands which are pinned together at the bottom. pin, 42, passes through ears 43 in a small casting 44 which is fastened to a bar 45 for holding the band from rotary '(lisplacei'liexxt. A pin'or bolt 46 passes through thc upper end of the bands and a spring 47 thereon is compressed by a handwheel 48'depcnding upon the braking eii'ect desired. This bolt is held from rotary arm 49 extending from a frame piece. As the brake block is moved to the right, the brake band is immediately expanded by the wedging effect on the rollers and the outer riction cone is released.-

The inner friction cone is forced into the displacement by anv vloo is fast to shaft 34, Figs."

This

mounted and keyed to the same shaft. A

yoke 53 extends from shaft 35 and engages mem collar 52 sfo as to move it with shaft 35 to straighten or open' the toggle links and cause engagement or disengagement of the clutch ers. Thus a right hand movement `of sliding shaft 35 causes sleeve 21 to be driven through the cone clutch by the continuously rotating power shaft 19.

It is important that the knife be vstopped in its upper position at the end of, every cutting stroke, and to do' this with the certainty necessary requires that the clutch be released and the brake be applied automatically and with a precision that will insure a stoppage of the travel of the knife at the exact position desired. Vhen the, machine is started, shaft 34 is rocked clockwise, Fig.I

1,v and arm 54 raises loop 55 by means of links. 56. There is securely fastened to shaft 15 a disk 57 (Figs. 1, 6 and 7) which carries a. cam finger 58 pivoted thereto and set into a sector 59 cutinto the disk so as to limit4 its are of swing. Just before the end of a revolution of shaft 15, cam finger 58 strikes roller 60 dn loop 55 and the finger is pivoted rearwardly against the effect of spring 61 until it bears against abutment 62 (Fig. 6),`

The continued motion of the disk causes the cam finger to force the roller 60 and loop 55 down and thus cause a sudden counterclockwise movement of shaft34 which'kicksV v shaft 35 to the left, breaking the cone friction clutch drive connection and causin the brake band to seize the outer surface ol the outer cone of the clutch by the withdrawal of wedges 39 already described. By careful adjustment, whatever desired position of stoppage of the knife may be obtained. Spring 61.is provided to push finger 58 forwardly to the position shown in Fig. 7, after it has functioned to depress loop so that the loope may be raised for the next operation without interference.

When the knife is in its raised pbsition,

it is desirable to lock it there as a safety precaution and4 the locking means are under the control of Shaft 34. Fastened to the rear of the right `hand knife stock strap 11 is a piston rod 63 whichca'rries at its lowerl end a piston head which travels in a cylinder 64 having an opening at the bottom t0 allow yoil to be drawn in or out, depending upon the direction of movement of the piston. When the knife is rising, the piston draws oil from a reservoir 65; and when the knife hasreached'its upper limit, a valve 66 is closed b means of the movement conveyed throug link 67 and one arm of yoke 36 (Fig. 3) on shaft 34 bythe sudden downward movement of loop 55, thereby preventing the discharge of oil from the cylinder and a consequent drop of the knife. When shaft 34 is vrocked clockwise (Fig. 1) in starting thefmachine, the valve will be im Two-piece clamp.

In one modification of my machine the paper to be cut ma be held in place before the application of tii by a foot-opcratedclamp. Tie means for preliminary clamping comprises a lower clamp 70 connected at its ends to a pair of vertical slides 7l, Fi s. 3, 4 and 5. The lower ends of these slides each have a pin 72 adapted to' fit into an. elongated recess at the extremity of each arm 73 fastened to shaft 74. Shaft 74 has at its center a crank arm 75 at the end of which is connected a link 76 pivoted at its lower end to treadle 77, the Yrear end of which is rotatively mounted on the middle tie-rod 3.

Springs 78 are stretched between arms 73 and slides 71 so as to keep the arms elevated and create a lost motion between them and the slides when the foot is first applied to the treadle. J

At the top, each slide 71 is equip ed with a stud 79 extending laterallythere rom and carrying a socket 80 for the retention of a rod 81. This rod slides through a block 82 and is encircled by a helical spring 83 the lower end of which bears in a recess in the block.

compression in the spring normally holds against the upper clamp 84. l

After the paper 1s initially clamped, up-

It will therefore be seen that the per clamp 84 is allowed to bedepressed by power means subsequently to be described and cornes quickly into contact with the lower clamp which is bearing.. against the pile of papel', and before the knife reaches the top of the pile of paper, a final applica-.

tion of pressure is made. Itis evident that both clamp 70 'and clamp 84 may bedeprcssed simultaneously through the operation of upper clamp 84.

Upper cla-mp 84 consists of a channel-V shapedcasting and is fastened at its ends to slides 85which are guidedto slide in a vertical direction by grooves in side frames 1 and 2, and are themselves designed to form the guiding means for slides 71. To each of the lower ends of slides 85 is secured a block 82/havingl 'a rack engaging a sectors 86 keyed to shaft 87. Power 1s applied to the Kclamp through vthis shaft by means of the mechanism about to be described.

Just to the rightof the center of shaft 87 5) there are'mounted two ,collars88 f 

